Anyone pondered an exhaust brake?

durangotang · **Posted:** Mon Feb 18, 2008 11:50 pm

Just curious if you guys have thought about it... seems like it could be a cool little project.

warp2diesel · **Posted:** Tue Feb 19, 2008 12:37 am

I though about one until I saw the price and it was outrageous :!:

Your CRD could us a lot of the other functional and cool mods instead.
One thing that concerns me is how it would react with the EGR

The SEGR option may make the EGR potential problem a mute point.
Do you travel allot in mountains?

durangotang · **Posted:** Tue Feb 19, 2008 12:44 am

Mountains were the main reason I was thinking about it.... it's been pretty common for my brakes to be actually smoking after some longer/twistier mountain passes.... that lovely combination of altitude and % grade does wonders on brakes...

warp2diesel · **Posted:** Tue Feb 19, 2008 12:48 am

http://www.usgear.cc/dcel_appprice.htm

$1250.00 Stiff

You may find a used one for less, I did when I needed an overdrive.

Steve

litton · **Posted:** Tue Feb 19, 2008 9:43 am

The stock muffler does a pretty good job as an exhaust brake.

MrMopar64 · **Posted:** Tue Feb 19, 2008 12:08 pm

The VGT on this application won't support an exhaust brake. The vastly increased back-pressure on the turbine can damage the vanes and/or the actuator. Normally for VGT/VNT applications, the exhaust brake is electronically integrated and when operation is requested it will close the vanes 100% and thus brake the engine.

warp2diesel · **Posted:** Tue Feb 19, 2008 12:51 pm

Is that why the exhaust brake kit price is so high, $1250.00 :?:

Could a kit like the SEGR kit be made up to do this :?:

TurboTim may know.

UFO · **Posted:** Tue Feb 19, 2008 1:04 pm

What's wrong with gearing down on grades? Works for me -- I don't like to heat up my brakes in case I have to stop.

nursecosmo · **Posted:** Tue Feb 19, 2008 1:52 pm

I have thought about putting a manual cable of some sort on the actuator for the VGT, but can't figure out how it would be disengaged from the system for normal operation.

Turbo Tim · **Posted:** Fri Feb 22, 2008 2:56 pm

This is an interesting question. Without looking closely at the vanes on the turbo, it may not be possible (within reason).

Another question that needs to be answered is can the torque converter take the load coming from the other direction? It’s weenie enough from the torque from the engine side, but from the tranny side?

Something to ponder……

CATCRD · **Posted:** Fri Feb 22, 2008 8:49 pm

Why don't you put a manual cable on the FCV throttle plate?

nursecosmo · **Posted:** Fri Feb 22, 2008 9:42 pm

CATCRD wrote:

Why don't you put a manual cable on the FCV throttle plate?

The problem that I can see there is that a diesel engine would create a much higher vacuum than what a gasser sees when throttled down. That would likely cause a large amount of oil to be sucked past the rings which are not designed for vacuum as well as throwing a CEL. The gearing on the FCV would probably not allow manual operation anyway but an electrical switch might work.

warp2diesel · **Posted:** Sat Feb 23, 2008 12:04 am

...initial position when the fuel rate is cut to idle and lowering the boost to zero? If this is correct, with a VGT all we would need to do is take our foot off the accelerator to get the partial benefit of an exhaust brake. As I have observed with all of my turbo diesels over the years, remove your foot and the boost drops to zero, even when I was going down a hill. I will confirm the CRD drops the boost to zero on deceleration when I get my gauges hooked up.

Steve :wink:

nursecosmo · **Posted:** Sat Feb 23, 2008 12:47 am

warp2diesel wrote:

...initial position when the fuel rate is cut to idle and lowering the boost to zero? If this is correct, with a VGT all we would need to do is take our foot off the accelerator to get the partial benefit of an exhaust brake. As I have observed with all of my turbo diesels over the years, remove your foot and the boost drops to zero, even when I was going down a hill. I will confirm the CRD drops the boost to zero on deceleration when I get my gauges hooked up.

Steve :wink:

Yes the VGT does go to a 0 degree angle when no accelerator input is detected. This serves two purposes, it helps economy in most coasting situations, and prevents overboost in a system without a wastegate. buy changing the vanes to an oblique angle it #1 introduces an increased restriction in the exhaust outlet, and #2 draws energy from the motor by trying to pump more air without adding more fuel.

Anyone pondered an exhaust brake?

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